20% of Angola's population is Chinese.

Also note that there are countries (although without such a Chinese influence) who will have major demographic shortages. A good example is Botswana which has an HIV/AIDS prevalence rate of 38%.

Do you have a citation of a source that says this? I just tried the usual kind of online sources for national population statistics for Angola, but I haven't found confirmation of this interesting statement.

http://en.wikipedia.org/wiki/Demographics_of_Angola#Ethnic_g...

https://www.cia.gov/library/publications/the-world-factbook/...

Just note that the citations from the CIA world factbook is probably worthless. In the official demographics of South Africa for example, neither illegal immigration or temporary migration is noted.

This is fairly high though (as much as 3 million Zimbabweans and many people form other African countries such as Somalia).

I see posts claiming a 100,000 works in the formal sector (i.e. working for formal companies). The number of Chinese working in the informal sector or illegally would be unknown.

But the 20% figure is most probably wrong.